<?php
/**
 * Plugin Name: Auto Related Posts
 * Description: Автоматически добавляет похожие записи после контента. Вывод в 2 ряда по 3 статьи.
 * Version: 1.0
 * Author: Ведерников Сергей
 */

// Запрет прямого доступа
if (!defined('ABSPATH')) {
    exit;
}

class AutoRelatedPostsPlugin {
    
    public function __construct() {
        add_filter('the_content', array($this, 'auto_insert_related_posts'));
        add_action('wp_enqueue_scripts', array($this, 'enqueue_styles'));
        add_shortcode('related_posts_grid', array($this, 'related_posts_shortcode'));
    }
    
    public function enqueue_styles() {
        if (is_single()) {
            $css = "
            .related-posts-grid-wrapper {
                margin: 40px 0;
                padding: 30px 0;
                border-top: 2px solid #f0f0f0;
                border-bottom: 2px solid #f0f0f0;
            }

            .related-posts-title {
                text-align: center;
                margin-bottom: 35px;
                font-size: 28px;
                color: #2c3e50;
                font-weight: 600;
            }

            .related-posts-grid {
                display: grid;
                grid-template-columns: repeat(2, 1fr);
                gap: 30px;
            }

            .related-post-item {
                background: #ffffff;
                border-radius: 12px;
                overflow: hidden;
                box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
                transition: all 0.3s ease;
                border: 1px solid #eaeaea;
            }

            .related-post-item:hover {
                transform: translateY(-5px);
                box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
            }

            .related-post-link {
                text-decoration: none;
                color: inherit;
                display: block;
                height: 100%;
            }

            .related-post-thumbnail {
                width: 100%;
                height: 200px;
                overflow: hidden;
                position: relative;
            }

            .related-post-thumbnail img {
                width: 100%;
                height: 100%;
                object-fit: cover;
                transition: transform 0.3s ease;
            }

            .related-post-item:hover .related-post-thumbnail img {
                transform: scale(1.05);
            }

            .related-post-content {
                padding: 20px;
            }

            .related-post-heading {
                margin: 0 0 12px 0;
                font-size: 18px;
                line-height: 1.4;
                color: #2c3e50;
                font-weight: 600;
            }

            .related-post-excerpt {
                font-size: 14px;
                line-height: 1.5;
                color: #666;
                margin: 0;
            }

            /* Адаптивность */
            @media (max-width: 1024px) {
                .related-posts-grid {
                    gap: 20px;
                }
                
                .related-post-thumbnail {
                    height: 180px;
                }
            }

            @media (max-width: 768px) {
                .related-posts-grid {
                    grid-template-columns: 1fr;
                    gap: 20px;
                }
                
                .related-post-thumbnail {
                    height: 160px;
                }
                
                .related-post-content {
                    padding: 15px;
                }
                
                .related-posts-title {
                    font-size: 24px;
                    margin-bottom: 25px;
                }
            }

            @media (max-width: 480px) {
                .related-posts-title {
                    font-size: 22px;
                }
                
                .related-post-heading {
                    font-size: 16px;
                }
                
                .related-post-excerpt {
                    font-size: 13px;
                }
            }
            ";
            
            wp_add_inline_style('wp-block-library', $css);
        }
    }
    
    public function auto_insert_related_posts($content) {
        // Добавляем только к одиночным записям и не в админке
        if (is_single() && !is_admin()) {
            $related_posts = $this->get_related_posts_content();
            $content .= $related_posts;
        }
        
        return $content;
    }
    
    public function related_posts_shortcode($atts) {
        return $this->get_related_posts_content($atts);
    }
    
    private function get_related_posts_content($atts = array()) {
        $atts = shortcode_atts(array(
            'posts_count' => '6',
            'title' => 'Похожие статьи'
        ), $atts);
        
        ob_start();
        global $post;
        
        if (!$post) {
            return '';
        }
        
        $post_id = $post->ID;
        $categories = get_the_category($post_id);
        
        if (!$categories) {
            return '<p>Похожих записей не найдено.</p>';
        }
        
        $category_ids = array();
        foreach($categories as $individual_category) {
            $category_ids[] = $individual_category->term_id;
        }
        
        $args = array(
            'category__in' => $category_ids,
            'post__not_in' => array($post_id),
            'posts_per_page' => intval($atts['posts_count']),
            'ignore_sticky_posts' => 1,
            'orderby' => 'rand',
            'post_status' => 'publish'
        );
        
        $related_query = new WP_Query($args);
        
        if($related_query->have_posts()) {
            ?>
            <div class="related-posts-grid-wrapper">
                <h3 class="related-posts-title"><?php echo esc_html($atts['title']); ?></h3>
                <div class="related-posts-grid">
                    <?php while($related_query->have_posts()) : $related_query->the_post(); ?>
                        <?php 
                        $thumbnail_url = get_the_post_thumbnail_url(get_the_ID(), 'medium');
                        $excerpt = has_excerpt() ? get_the_excerpt() : wp_trim_words(get_the_content(), 12, '...');
                        ?>
                        
                        <article class="related-post-item">
                            <a href="<?php the_permalink(); ?>" class="related-post-link">
                                <?php if($thumbnail_url) : ?>
                                    <div class="related-post-thumbnail">
                                        <img src="<?php echo esc_url($thumbnail_url); ?>" alt="<?php the_title_attribute(); ?>" />
                                    </div>
                                <?php endif; ?>
                                <div class="related-post-content">
                                    <h4 class="related-post-heading"><?php the_title(); ?></h4>
                                    <div class="related-post-excerpt">
                                        <?php echo esc_html($excerpt); ?>
                                    </div>
                                </div>
                            </a>
                        </article>
                    <?php endwhile; ?>
                </div>
            </div>
            <?php
        } else {
            echo '<p>Похожих записей не найдено.</p>';
        }
        
        wp_reset_postdata();
        return ob_get_clean();
    }
}

new AutoRelatedPostsPlugin();

// Активация плагина - создаем опции по умолчанию
register_activation_hook(__FILE__, function() {
    add_option('auto_related_posts_enabled', 'yes');
});

// Деактивация плагина - чистим настройки
register_deactivation_hook(__FILE__, function() {
    delete_option('auto_related_posts_enabled');
});
?>

[[related_posts_grid]]

[[related_posts_grid posts_count="6" title="Рекомендуемые статьи"]]